Prediction of Intralaminar Fracture Toughness of Two Directional Glass Fibre Reinforced Polyester Laminated Composite Plate
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The behaviour of notched laminate has not been addressed to any great extent in literature. Because of their anisotropic nature it is difficult to entirely envisage their mechanical characteristics and behaviour, particularly if they are produced with complicated architectures, as in the case of the woven reinforcements. This work is designed to provide more details on the effect of the orientation and site of the layers on the propagation of the crack in the laminates (2D). Seven laminate configurations were tested using the compact tension (CT) specimens according to ASTM Standard E399-90. The initialisation and the development of the zone of damage are studied by using digital image correlation (DIC) technique. Linear elastic fracture mechanics (LEFM) have provided good predictions for the failure loads of these composite and consistent values of fracture toughness for crack initiation, KI-init., and crack propagation, KI-prop., were calculated. These last can strongly be related to the lay-ups orientation.
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